Heat-treating furnace



7/ Feb. 24, 1931. F. T. COPE HEAT TREATING FURNACE Filed Oct 3mm Fra mz'a e M M m w Patented Feb. 24, 1931 UNITED STATES PATENIT'QFFICE rm:'1'. corn, or sauna, omo, assrenoa'ro ran ELECTRIC summon comramr,

or sum, one, A coaroaarron or onro HEAT-TREATING FURNACE Applicationfiled October 8, 1829. Serial No. 397,017.

The invention relates to heat treating furnaces of'that type in whichthe articles to be heated or heat treated are carried in a basket orcontainer through which hot airis continually circulated. a

The object of the improvement is to provide a furnace especially adaptedfor the heat treatment of small articles which are. placed in thefurnace ina container or receptacle sealed at both ends, a baflie wallbeing located between the heating means and the container, and aperforate pressure chamber beinglocated within the receptacle androvided with a fan or the like for continually orcing heated airthrou hthe container, the air within the furnace cl iamber as it is cooledpassing downward past the heating means where it is reheated and againcirculated upward through the container.

An embodiment of the invention is illustrated in the accompanyingdrawing, in which The figure is a vertical sectional view throu hafurnace constructed in accordance witht einvention.

Similar numerals refer to similar parts throughout the drawing. 7 Thefurnace may be of any usual and well known construction, comprising theside walls 10 and bottom wall 11 formed of suitablerefractory materialand enclosed in the metallic shell 12, the entire structure beingpreferably supported spaced above the fioor 13 as by the channel irons14.

The furnace is preferably provided with a 85 removable roof or crown 16of suitable refractory material enclosed in the metal shell or frame 17and preferably provided with the depending flange 18 for normal entranceinto the sand sealing channel 19 carried at the upper open end of thefurnace proper.

For the purpose of easily removin and. replacing the roof or crown, averti'ca post 20 may be supported at one side of the furnace and havemounted thereon the sliding bracket 21 provided with the horizontal arm22 connected to the central portion of the roof frame or shell.

A weighted lever 23 may be rovided for counterbalancing the weight of te roof when HElSSllED described. Bafiie walls 25 are located'within thefurnace chamber and spaced a slight distance from the. heating elements.

These baflie walls terminate, at their upper ends near the upper end ofthe furnace chamher, the lower ends thereof being extended toward thecenter of the furnace as at 26 and terminating in a hollow frustum 27.

A fan 28 is located at the base of the frustum, being mounted on thevertical shaft 29 journaled through a suitable bearing 30, in the bottomwall of the furnace, and driven by any suitable means, such as the motor31 ivivhich may be located within a pit 32 in the oor.

The container or basket, which receives the articles to be heat treated,is adapted to be placed within the bafie walls 25 and rest upon thehorizontal portions 26 thereof and is indicated generally at 33, beinpreferablyprovided at its lower end with the depending flanges or fins34: for contact upon the horizontal walls 26.

This container is preferably provided with the central pressure chamber35 which may be sli htly coned at its lower end as at 36,

where y the container may be easily centered upon the frustum 27.

Openings 37 are formed in the side walls and pressure chamber of thecontainer, the up r end of the tube being closed as by the wall 38 and aremovable cover 39 being provided for closing the body portion of thecontainer.

In operating the furnace, the articles to be heat treated are placedwithin the container 33 and the roof of the furnace is then raised andmoved to oneside, permitting the container to be lowered into place asshown in the drawing. 1

The roof is'then replaced upon thefurnace and the fan 28 operated,circulating the air in the direction of the arrows shown in the drawing,the hot air passing upward through the frustum 27 and into the pressurechamber 35,1passing through the openings therein and t rough thecontainer and then out through the open' I 1 of'the container and upwardover the b ii wall 25.

As the air 0001s it descends past the heating elements 24 where it isreheated and again circulated through the pressure chamber andcontainer. It will be seen that this 9 tends tomaintain an eventemperature in the articles in all parts of the container, thus' vinigeach article substantially the sameeat treatment as all of the otherarticles in the furnace.

near the top of the chamber, a basket provided with rforated side wallsfor holding material within the baflie walls, and means for circulatingair upward into the basket and out throu h the perforated side walls anddownwar between the heating means and bafie walls.

2. A furnace including a chamber, heating means at the sides of thechamber, bafile walls aced from the heating means andfrom the bottom ofthe chamber, and terminating near the top of the chamber, a basketrovided with perforated side walls for hol in Imaterial within thebafiie walls, anda an in the chamber for circulating air upward into thebasket and out throu h the perforated side walls and downward etween theheat ing means and bafie walls.

' 3. A furnace includin a'chamber, heating means at the sides thechamber, baffle walls s aced from the heating means and from the gottomof the chamber, and terminating near the to of the chamber, a basketprovi ed with per orated side walls for holdmg materi'al within thebafle .walls, and a fan in the bottom of the chamber for circulating air..upward into the basket and out througlgtheperforated side walls anddownward tween the heating means and bafile walls.

a. A furnace including a chamber, heat- M ing means at the sides of thechamber, baf

. fie walls spaced from the heating means and from the bottom of thechamber and extending inwardl adjacent the bottom of the chamber, anterminating near the top'of the chamb r, a hollow frustum at the innertermifor holding material within the baflie walls, said basket having acentral, perforate pressure chamber adapted to register with saidbasket, and means'for circulating air upward through the hollow frustumand pressure,

from the bottom of the chamber and extend-' ing inwardly adjacent thebottom of the chamber, and terminating near the top of the chamber, ahollow frustumat the inner termination of the bafiie walls, a perforatebasket for holdin material within the bafiie .walls, said basket havinga central, perforate pressure chamber adapted to register with saidhollow frustum, a cover for the top of the basket, and a fan at thebottom of the hollow frustum for circulating air u ward through thehollow frustum and per orate pressure chamber, throu h the basket, anddownward between t e heating means and bafile walls.

6. A furnace includin a heatin cham-- ber, baflle walls spaced rom thesi e walls of the heating chamber and from the top and bottom of thechamber, a material receptacle having a perforate outer wall spaced fromthe bafile walls, a 'ressure chamber within the receptacle and avin aperforate wall, the top and bottom of t e receptacle being sealedwhereby fluid from the pressure chamber must pass through the materialin the receptacle, heating means located in the path of t e fluid, andmeans for circulating air upward through the pressure chamber.

7. A furnace including a. chamber, heating v means at the sides of thechamber, baflie walls space from the heating means and from the bottomof the chamber and extending inwardly adjacent the bottom of thechamber, said baflle walls terminating near the top of the chamber, anair inlet at the inner termination of the baiiie walls, a basket forholding material within the baflle walls and provided with perforatedside walls, said basket having a central, perforate pressure chamber adated to register with said air inlet, a cover or the top of the basket,and meansfor circulatin'g air upward through the air inlet, outwardthrough the perforate pressure chamber into and through the basket,outward through the perforated side walls of the basg'ket, and downwardbetween the heating means and bafile walls. I

.In testimony that I claim the above, I have hereunto subscribed m name.

. RANK T. COPE.

' nation of the baffle walls, a perforate basket.

at hollow frustum, a cover for the top of the 1

